Run stwo doc tests in nightly

Author: maciektr

.github/workflows/ci.yml

@@ -109,7 +109,12 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: run tests
-        run: cargo test --doc
+        run: cargo test --doc --workspace --exclude scarb-prove --exclude scarb-verify --exclude scarb-execute
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_NIGHTLY_TOOLCHAIN }}
+      - name: run nightly tests
+        run: cargo test --doc -p scarb-prove -p scarb-verify -p scarb-execute
 
   scarb-metadata-compatibility:
     name: scarb-metadata compatibility check